Steam-boiler



0; W.=TOW.N S,E ND, STE/AM BOILER.

' Patented July 14, 1896'.

WITNESSES:

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UNITED STATES PATENT OFFICE.

CHARLES TOWVNSEND, OF SEIVICKLEY, PENNSYLVANIA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 564,037, dated July 14, 1896.

Application filed March 2,1896. Serial No. 581,422. (llo model.)

T0 aZZ whom it may concern:

Be it known that I, CHARLES W.loWNsEN1), a citizen of the United States, residing at Sewickley, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new and useful Improvements in Steam-Boilers, of which improvements the following is a specification.

, The invention described herein relates to certain improvements in boilers of the cylindrical, fire, tubular, and flue types, and has for its object the provision of two circulating chambers or compartments, into one of which water is fed, being located at the cooler portion of the boiler,while the other chamber or compartment is at the hottest portion of the boiler. This arrangement will insure the settling of impurities where there is the least liability of their becoming baked onto the heating-surfaces, and will also permit of the water in the other compartment being heated to a higher temperature than in boilers where there is free circulation throughout their entire length.

In the accompanying drawings, forming a part of this specification, Figure 1 is a sectional elevation of a fire-box tubular boiler having my improvement applied thereto.

Figs. 2 and 3 are similar views of a horizontal tubular boiler and a flue-boiler, respectively, having my improvement. Figs. 4, 5, and 6 are elevations of different forms of diaphragm or division-plate.

In the practice of my invention, which is applicable to cylindrical, fire, tubular, and flue boilers, the latter is constructed in the usual or any suitable manner, and a diaphragm or division-plate 1 is so secured within the shell 2 of the boiler as to divide the latter transversely into two compartments or chambers 3 and 4. In applying the invention to fire, tubular, or fine boilers the diaphragm 1 is secured in position prior to the insertion of the tubes or flues, and is provided with openings corresponding to those in the tube or fine sheets for the passage of the tubes or fines. Provision is made for the flow of water from one compartment or chamber to the other by forming a series of holes 5 or notches 6 in the diaphragm or divisionplate at some point or points below the normal water-level. The two compartments are also placed in communication with each other above the normal water-level by means of holes 7, formed through the diaphragm or division-plate, as shown in Fig. 5, or by cutting away the upper edge of the diaphragm, as shown in Fig. i. In lieu of providing a direct steam connection between the two compartments they may be connected to the steam-drum S by means of the dry pipe 9, which extends through the diaphragm, as shown in Fig. 1, or the steam-drum mayhave independent connection with the compartments or chambers, as shown in Fig. 3.

The feed-water pipe 10 is connected to the compartment or chamber 3, preferably near the rear or cooler end thereof.

While the openings in the diaphragm below the water-level are made of a size to permit a sufficient quantity of water to flow into the compartment 4 to compensate for vaporization in the latter compartment, they should not be large enough to permit any material circulation between the two compartments. Hence two independent systems of circulation will be established and opportunity will be afiorded for the settling of any impurities to settle on the surfaces in the compartment As the surfaces of the compartment will be comparatively cool, the impurities will not be baked or hardened, and can be readily removed by washing. As the water flowing into the compartment or chamber 4 will be practically free from impurities, little or no scale will be formed on its surfaces, which will, therefore, be in a most efficient condition. In addition to the prevention of the formation of scale on the highly-heated surfaces, the retention of the cool water in a separate compartment, and its gradual flow, after being heated, into the other compartment, will permit of the Water in compartment 4 being raised to a higher temperature with the same amount of coal than in boilers where the circulation is throughout the whole length of the shell. In order to more readily efiect this superheating, the diaphragm is preferably so located that the compartment or chamber 4 adjacent to the furnace is considerably smaller than the compartment 3.

In lieu of the holes or notches in the diaphragm, a water connection between the two compartments can be formed by means of a bent pipe 11, whose ends project through the shell on opposite sides of the diaphragm, as shown in dotted lines in Fig. 3; or, if desired, the openings in the diaphragm through which the tubes or fines pass can be made of a diameter a little greater than the external diameter of the tubes or flues.

I claim herein as my invention 1. A boiler having in combination therewith one or more transverse diaphragms or division-plates dividing the boiler into two or more chambers whereby two or more independent systems of circulation may be had, a connection from each compartment to the steam drum or space, and a Water connection between the compartments equal or not materially exceeding in capacity what may be required for maintaining the same watermy hand.

CHARLES W. TOWNSEND. lVitnesses:

DARWIN S. \VoLooT'r, M. S. MURPHY. 

